LETTER OF TRANSMITTAL. 



U. S. DEPARTMENT OF AGRICULTURE, 



FOREST SERVICE, 



Washington, D. C., January 30, 1912. 



SIR: I have the honor to transmit herewith a manuscript entitled 

 "Wood Turpentines: Their Analysis, Refining, and Composition," by 

 L. F. H^awley, chemist in forest products, and to recommend its pub- 

 lication MS Bulletin 105 of the Forest Service. The investigation 

 was carried on at the Forest Products Laboratory maintained in 

 cooperation with the University of Wisconsin. The Yellow Pine 

 Manufacturers' Association contributed funds toward the purchase 

 of the refining still. The crude turpentines used in the refining 

 experiments were obtained through cooperation with the producers. 

 Mr. Ernest Bateimm, chemist in forest products, collaborated in the 

 development of the analytical methods and analyzed some of the 

 products of the refining. Mr. F. E. Lichtenthaeler, formerly assist- 

 ant chemist, did most of the work in connection with the installation 

 of the refining apparatus. 



Respectfully, HENRY S. GRAVES, 



Forester. 

 Hon. JAMES WILSON, 



/Secretary of Agriculture. 



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